The frame of the window he is leaning out of is gone. So this plane was probably receiving maintenance, guy saw the window was removed, grabbed a selfie stick, took the photo, then shopped it onto a sky background. Plane has to be still, not only because this would be extremely hard, if not physically impossible to do, but dude's hair isn't even in motion.
The cockpit windows open on either side so that the pilots can clean the windshield easily on the ground, and then also to serve as an emergency exit with a rope ladder can be dropped out
Yeah last time this came up (the image was over five years old) the conclusion was that the photo was taken on the ground and the background was replaced.
By piecing together different aspects from multiple pics - the plane, guy, stick etc. all being real but then clouds added later, covering up landing gear.
If you think you can open the front window of a 737 above the clouds and the only thing that happens is that your tie is slightly blown to the side then you have a very limited grasp of reality.
"in general, the cruising speed of a 737 is around 500-600 mph (800-970 km/h)."
Hurricane force wind is 74 mph (119 km/h)
An EF-5 tornado (top of the scale) is any with wind speeds of over 200 mph (322 km/h).
Here's a quote I found about a tornado (unknown rating):
"I've seen bits of straw embedded in telephone poles. Like all the way through. Something as flimsy as a piece of dried grass hurled with enough force to pierce through wood and come out the other side"
The jet is up to three times that speed. That selfie stick would be in multiple pieces in multiple people, pretty much instantly.
He's clearly not driving his plane at 600mph. And there isn't a tornado in the picture so the selfie stick and the hay are fine up there. It's real. Bigfoot, not real. 9/11, real. Vampires, not real. Pokemon, real.
No it is not. That window cannot be opened in flight. It is not locked or anything it is just physically impossible for it to be opened due to pressurized differences.